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Acquisitions - Schedule of Purchase Price Allocation (Details) - USD ($) $ in Millions	1 Months Ended
	Mar. 31, 2022	Sep. 30, 2023	Sep. 30, 2022	Sep. 30, 2021
Business Acquisition [Line Items]
Goodwill		$ 17,997	$ 17,787	$ 15,958
Tink AB
Business Acquisition [Line Items]
Deferred tax liabilities	$ (71)
Other net assets acquired (liabilities assumed)	25
Goodwill	1,577
Total	$ 1,866
Weighted-Average Useful Life	5 years
Tink AB \| Technology
Business Acquisition [Line Items]
Finite-lived intangibles	$ 245
Weighted-Average Useful Life	4 years
Tink AB \| Customer relationships
Business Acquisition [Line Items]
Finite-lived intangibles	$ 90
Weighted-Average Useful Life	6 years